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Study on the effects of 5d energy locations of Ce3+ ions on NIR quantum cutting process in Y2SiO5: Ce3+, Yb3+

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Abstract

The effects of the 5d energy locations of Ce3+ centers on the NIR quantum cutting process were studied in Y2SiO5 with two different substitutional Y3+ lattice sites for Ce3+ and Yb3+. Powder XRD and Rietveld refinement were used to characterize phase purity, crystal structure, lattice parameters and occupation fractions of Y2-x-yCexYbySiO5 (x = 0.002 and 0.3, y = 0-0.2). PLE and PL spectra show that both kinds of Ce3+ centers in Y2-x-yCexYbySiO5 can cooperatively transfer energy to Yb3+-Yb3+ ions pair. The dependence of the integrated emission intensities of Ce3+ and Yb3+, decay lifetime (τ) of Ce3+, nonradiative energy transfer rate (KCe→Yb), cooperative energy transfer efficiency (ηCET) and quantum efficiency (ηQE) on the concentration of Yb3+ ions were studied in details. More importantly, these results demonstrate that the 5d energy locations of Ce3+ ions have a great influence on NIR quantum cutting process in Ce3+-Yb3+ system: the closer they are to twice the absorption energy (~20000 cm−1) of Yb3+, the higher the cooperative energy transfer efficiency from the lowest 5d excited state of Ce3+ to the Yb3+-Yb3+ ions pair.

©2012 Optical Society of America

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Figures (7)

Fig. 1
Fig. 1 Schematic energy level diagram on QC process of Tb3+-Yb3+ and Ce3+-Yb3+ couples in some specific systems: (a) borate glasses; (b) YBO3 phosphor and (c) YAG ceramics.
Fig. 2
Fig. 2 Experimental (crosses) and calculated (red solid line) XRD patterns and their difference (blue solid line) for Y1.64Ce0.3Yb0.06SiO5. One set of tick mark shows the Bragg reflection positions of the phase Y1.64Ce0.3Yb0.06SiO5. Inset: the crystal structure of corresponding unit cell.
Fig. 3
Fig. 3 (a), (c) Excitation, (b), (d) UV-vis and NIR emission spectra of Y1.998-yCe0.002SiO5: yYb3+ and Y1.7-yCe0.3SiO5: yYb3+. The visible and NIR emission intensities are not plotted on the same scale.
Fig. 4
Fig. 4 Dependences of the integrated NIR and Vis emission intensity of (a) Y1.998-yCe0.002SiO5: yYb3+ex = 356 nm) and (b) Y1.7-yCe0.3SiO5: yYb3+ex = 372 nm) on the concentration (y) of Yb3+. The integrated visible and NIR emission intensities are not plotted on the same scale.
Fig. 5
Fig. 5 Schematic energy level and cooperative energy transfer (CET) mechanism of Ce3+ and Yb3+ in Y2SiO5 host
Fig. 6
Fig. 6 Decay curves of (a) Y1.998-yCe0.002SiO5: yYb3+ phosphor (y = 0 and 0.2) and (b) Y1.7-yCe0.3SiO5: yYb3+ phosphor (y = 0 and 0.06)
Fig. 7
Fig. 7 (a) Decay lifetime (τ) of Ce3+, (b) nonradiative energy-transfer rate (KCe→Yb), (c) CET efficiency (ηCET) and (d) quantum efficiency (ηQE) as a function of Yb3+ concentration (y) in Y1.998-yCe0.002SiO5: yYb3+ [Ce3+(1)] and Y1.7-yCe0.3SiO5: yYb3+ [Ce3+(2)], respectively.

Tables (1)

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Table 1 Final Refined Structural Parameters for Y1.64Ce0.3Yb0.06SiO5 a

Equations (4)

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d N Ce dt = N Ce τ 0 K CeYb N Ce =( 1 τ 0 + K CeYb ) N Ce = N Ce τ 0
K CeYb = 1 τ 1 τ 0
η CET =1 τ τ 0
η QE = η Ce ( 1 η CET )+2 η Yb η CET
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